Right now, I think the most important thing is that you are feeling your baby kick and this will be extremely important once you are in your ninth month....I always remember my obgyn telling me this.
The pain/discomfort you are feeling could be your baby moving down and she is growing therefore all of your organs are getting squished.
In my last trimester, particulary right near the last month I was getting sharp pains in my pelvic region (it felt like someone was sticking a knife right up inside of me)---my doc. said this was normal and that the baby was moving lower.
If you are concerned ask your doc. the next time you go for your checkup
You should make a list of all your concerns and questions so you don't forget and go through each concern with him/her. That's what I used to do.